Potentiometric studies on the chelation behaviour of lanthanons with 3-hydroxy-2-methyl-1,4-naphthoquinone (HMNQ)

摘要

The chelation behaviour of complexes of La(III), Pr(III), Nd(III), Y(III), Sm(III) and Tb(III) with 3-hydroxy-2-methyl-1,4-naphthoquinone has been studied potentiometrically in 75 (v/v) aqueous dioxan medium at various ionic strengths. The method ofBjerrumandCalvin, as modified byIrvingandRossotti, has been used to find values of$$mathop nlimits^ -$$andpL. The stability constants and the values ofSminhave been calculated. The order of stability constants was found to be: La